OSTEOLOGY. 23 



A superior or concave buccal face, supporting the tongue. 



A circumference, convex anteriorly, with sockets for the six 

 incisors, and behind these for the two tusks. 



The space between the lateral incisors and tusks, is called the 

 dental interspace or bars. 



The superior extremity shows 



The condyloid process elongated transversely for articulation 

 with the glenoid cavity of the temporal. 



The neck, a constriction below this. 



The coronoid process, in front of the condyle, separated from 

 it by the sigmoid notch, is flattened on its sides, and receives the 

 insertion of the temporal muscle. 



The external face shows 



A smooth surface below, a rough one above, for the masseter. 



The internal face shows 



In its upper one-third the entrance of the inferior maxillo- 

 dental canal, which runs down under the teeth, giving off another, 

 the mental foramen (see above), and then continued in the bone 

 under the incisors. 



A smooth surface in its lower two-thirds. 



The mylo-hyoid ridge, a line running parallel with and below 

 the teeth. 



The genial surface, a rough spot at the junction of the two 

 sides. 



The anterior border shows 



The alveolar surface, already described, and a thin portion for 

 muscular insertion. 



The posterior border shows 



A sharp straight portion and a more rounded portion above, 

 changing its direction at this point. It is there called the angle. 

 Articulations, 2. 



The temporals. 



THE FOSS.E. 



The cranial cavity is oval in form, the walls formed by the 

 frontal, parietals and occipital above; the occipital, parietals, tem- 

 porals and sphenoid on the sides; the occipital basilar process, the 

 sphenoidal body, the transverse portion of the ethmoid, and in- 

 ternal surface of the frontal below. 



It is divided into anterior or cerebral and posterior or cerebellar 



